单项选择题

The development of a thoroughly effective treatment for narcolepsy is regarded by the author as（）

A．possible, but not very important
B．interesting, but too costly to be practical
C．promising, but many years off
D．extremely unlikely
E．highly probable

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单项选择题
The passage implies that research into the cause of human narcolepsy has been complicated by what aspect of the human brain（）

A．The tendency of certain neurons to resemble foreign matter that HLAs reject
B．A lack of apparent neurological damage caused by a tendency to remove debris through support cells
C．Its susceptibility to diseases like Parkinson's and Alzheimer's
D．Its tendency to reject the drugs which scientists have developed to treat narcolepsy's symptoms
E．The effects of aging on the symptoms of the disease
单项选择题
The passage supplies information to answer which of the following questions（）

A．Which species, human or dog, has greater numbers of the neurotransmitters that have been hypothetically linked to narcolepsy
B．At what age do human beings first experience the degenerative effects of narcolepsy
C．What role do human leukocyte antigens perform for the human immune system
D．Why did Honda initially suspect that HLAs played a role in narcolepsy
E．Which of the researchers named in the passage isolated narcolepsy as a distinct syndrome
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